A belt includes at least one fabric having a first face and a second face parallel to a longitudinal plane of the belt, wherein the fabric includes: a first weft layer formed by a plurality of multifilament weft yarns essentially parallel to each other; a second weft layer formed by a plurality of monofilament weft yarns essentially parallel to each other, wherein the multifilament weft yarns of the first weft layer are overlapped with respective monofilament weft yarns of the second weft layer; and a plurality of multifilament warp yarns wherein the fabric has a weft dominance satin weave on both sides.
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1. A belt comprising:
a first fabric,
a second fabric,
an intermediate layer of thermoplastic material arranged between the first fabric and the second fabric,
a transport surface formed on the second fabric by a covering layer of thermoplastic material,
wherein the first fabric has a first face and a second face parallel to a longitudinal plane of the belt,
wherein the first face of the first fabric is in contact with the intermediate layer, and an impregnation layer is applied on the second face of the first fabric,
wherein the first fabric comprises a first weft layer formed by a plurality of multifilament weft yarns and a second weft layer formed by a plurality of monofilament weft yarns,
wherein the multifilament weft yarns of the first weft layer are overlapped on respective monofilament weft yarns of the second weft layer,
wherein the first fabric has a satin weave on the first and second faces, the satin weave having a weft dominance on the first and second faces,
wherein in an elementary weave unit of the first fabric including four weft yarns and four warp yarns, i) each warp yarn is intertwined with just one multifilament weft yarn of the first weft layer and with just one monofilament weft yarn of the second weft layer, and ii) on each face of the first fabric, intertwining points of the warp yarns are not aligned with each other in a longitudinal direction of the multifilament and monofilament weft yarns or in a direction perpendicular to the multifilament and monofilament weft yarns.
3. The belt according to
4. The belt according to
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This application claims priority to Italian Patent Application No. 102019000000496 filed Jan. 11, 2019. The disclosure of the above application is incorporated herein by reference in its entirety.
The present invention relates to a belt comprising at least one fabric.
In the following description and in the claims, the term “belt” is intended to indicate a flexible element for transmitting movement or for transporting objects, such as for example transmission belts, conveyor belts, process belts, etc.
A belt, for example, a conveyor belt for moving objects, such as packages and the like, typically comprises at least one fabric and one or more layers of elastomeric or thermoplastic material. The fabrics used for constructing belts are formed of yarns that can be made of synthetic material, for example, polyester, aramid, polyamide, polyolefin, etc. or natural materials such as cotton, linen, hemp, etc. The yarns may also be made of fibers of mineral materials, such as glass or carbon. The fabric can be formed by multifilament or monofilament yarns.
In the sector of conveyor belts used in the logistics or transport of materials sector, the belts must have the following requirements:
A standard conveyor belt may have a transport side equipped with a PVC covering layer, a PET-fabric on the transport side, an intermediate PVC layer, a PET-fabric on the sliding side, and an impregnation layer on the sliding side.
Generally, the characteristics of low energy consumption and the low noise characteristics of a belt are mutually antithetical. Typically, a belt that is optimized to have low energy consumption is usually not optimal from the point of view of low noise and—conversely—a belt optimized for low noise is generally not optimal from the point of view of low energy consumption.
The weave and the characteristics of the fabric yarns are selected according to the characteristics to be optimized (low energy consumption or low noise).
The object of the present invention is to provide a belt that offers greater versatility in view of optimizing the characteristics of low energy consumption or low noise.
According to the present invention, this object is achieved by a belt having the characteristics forming the subject of claim 1.
Preferred embodiments of the invention form the subject of the dependent claims.
The claims form an integral part of the disclosure provided here in relation to the invention.
The present invention will now be described in detail with reference to the attached drawings, given purely by way of non-limiting example, wherein:
With reference to
The first fabric 12 has a first face 24 and a second face 26 parallel to a longitudinal plane A of the belt 10. The first face 24 of the fabric 12 is in contact with the intermediate layer 16. An impregnation layer 27 is applied on the second face 26 of the fabric 12, made of material with a low coefficient of friction forming the sliding surface 20.
The fabric comprises a first weft layer 28 forming the first face 24 and a second weft layer forming the second face 26. The first weft layer 28 is formed by a plurality of multifilament weft yarns 32 essentially parallel to each other. The second weft layer 30 is formed by a plurality of monofilament weft yarns 32 essentially parallel to each other. The weft yarns 32 of the first weft layer 28 are overlapped on respective weft yarns 34 of the second weft layer 30.
The multifilament weft yarns 32 can be formed of polyester filaments produced by extrusion. The multifilament weft yarns 32 can be high tenacity (HT) multifilament PET yarns with 92 filaments. In one embodiment, the multifilament yarn count 32 can be between 105 and 115 TEX (measured according to the UNI 9275 regulation: 1988 method A). For example, the multifilament yarn count 32 can be 110 TEX.
The multifilament yarn 32 can be a parallel yarn without twists. The weft layer 28 formed by parallel multifilament yarns is advantageous because it helps to create a barrier effect to the passage of PVC.
The monofilament weft yarns 34 of the second weft layer 30 can be polyester yarns produced by extrusion with a predetermined diameter. In one embodiment, the diameter of the monofilament yarns 34 can be between 0.28 and 0.32 mm, for example, 0.3 mm.
The weft yarns 32, 34 can be arranged with a density between 26 and 28 yarns/cm, for example, 27 yarns/cm.
The fabric 12 comprises a plurality of warp yarns 36 intertwined with the weft yarns 32, 34.
The multifilament warp yarns 36 can be formed of polyester filaments produced by extrusion.
The multifilament warp yarns 36 can be high tenacity (HT) multifilament PET yarns with 92 filaments.
In one embodiment, the warp yarn count 36 can be between 105 and 115 TEX (measured according to the UNI 9275 regulation: 1988 method A). For example, the multifilament yarn count 36 can be 110 TEX.
The multifilament yarn 36 is twisted, with a torsion number between 100 and 110 rounds/m, and never below 100 rounds/m (measured according to the UNI EN ISO 2061: 2010 regulation). For example, the number of twists can be 100 rounds/m.
The fabric 12 has a satin weave on both faces 24, 26 (bilateral satin weave). The satin weave of the fabric 12 has a weft dominance on both faces 24, 26.
In the representation of
Both faces 24, 26 have the same weave but differ from each other in that the face 24 has a dominance of multifilament weft yarns 32 while the face 26 has a dominance of monofilament weft yarns 34.
The weave illustrated in
With reference to
In each elementary weave unit including four weft yarns and four warp yarns, each warp yarn 361, 362, 363, 364 is intertwined with just one weft yarn 321, 322, 323, 324 of the first weft layer 28 and with just one weft yarn 341, 342, 343, 344 of the second weft layer 30.
On each face 24, 26 of the fabric 12 the intertwining points of the warp yarns are never aligned with each other in the longitudinal direction of the weft yarns or in the direction transverse to the weft yarns.
The different morphology of the two faces 24, 26 of the fabric 12 allows different properties of the belt to be obtained according to how the fabric 12 is oriented in the structure of the belt 10.
If the fabric 12 is arranged as shown in
If the same fabric 12 is arranged in the structure of the belt 10 in the opposite way, that is with the second weft layer 30 facing the intermediate layer 16 and the first weft layer 28 facing the sliding side, a belt 10 is obtained in which low noise is optimized, and partly a decrease in the friction coefficient.
The fabric 12 therefore allows two types of belt 10 to be produced with different characteristics using a single fabric. In particular, a belt 10 can be obtained in which the reduction of the friction coefficient is optimized or a belt 10 in which the noise reduction is optimized.
In both embodiments, the fabric 12 allows the adhesion with the intermediate layer 16 to be increased since both the faces 24, 26 of the fabric, having a predominance of weft yarns, favor a better adhesion to the intermediate layer 16, in particular in the case in which the intermediate layer is made of PVC, which adheres well on fabrics with a weft predominance.
The fabric 12, furthermore, allows reduction of the passage of PVC from the intermediate layer 16 towards the sliding face thanks to the barrier formed by the weft layer of the face of the fabric 12 adhering to the intermediate layer 16. Reducing the passage of PVC through the fabric reduces the friction coefficient in both modes in which the fabric can be oriented.
Moreover, the fabric 12 has a high transverse rigidity thanks to the weft layer 30 formed by monofilament yarns with a large diameter (for example 0.3 mm).
Of course, without prejudice to the principle of the invention, the details of construction and the embodiments can be widely varied with respect to those described and illustrated, without thereby departing from the scope of the invention as defined by the claims that follow.
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